Tert-Butylphosphonic Acid from Canada
Tert-butylphosphonic acid (t-BuP(O)(OH)2) contains direct P-C bond to tertiary butyl group. Classified HTS 2931.49.0080 as non-halogenated organo-phosphorus derivative. Used in metal surface treatment and polymer additives.
Duty Rate — Canada → United States
110%
Rate breakdown
9903.04.6096.3%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• pH stability data required for aqueous solutions
• Corrosive solid UN 3261; proper inner packaging essential
• Avoid classification as mixture if >90% purity